I think your dosage of thyroid hormone is too low for your body weight. For comparison, I take 150 ug of T4 and 5 ug of T3 (5 ug of T3 is equivalent to 20 ug of T4, so I take the equivalent of 170 ug of T4, and I weigh less than you (140lb)). Also, there is a wide range of TSH levels that are considered 'normal', some of us do better in the lower end of that range, i.e. is he correcting you to a TSH of 4 or 1, both are 'normal' but I feel much better at 1 than 4! I also do much better on the T4/T3 combo therapy than straight T4. I think you need to find a better endocrinologist.

I would also ask for a glucose tolerance test. I too was gaining weight, while biking 100 miles a week and eating 1200 cal a day. It wasn't until I got BOTH my thryoid replacement hormones optimized AND was diagnosed with impaired glucose tolerance (I undersecrete insulin) and started eating a low carb diet that normalized my blood sugars, that I slimmed down from 175 to 140 almost effortlessly, on ~1400 cal a day plus regular exercise.